LIST OF DIPTERA. 305 



veins black ; poisers piceous. Length of the body 13 — 15 lines ; of 

 the wings 24 — 26 lines. 



a. Silhet. From the Rev. J. Stainforth's collection. 



Dasypogon Rhypae, n. s., mas. et fem. Ater, capite ferrugineo, ab- 

 domine rufo, antennis nigris, pedibus rufis, coxis genubusque ni- 

 gris, tarsis piceis, alis cyaneo-nigris. 



Body deep velvet-like black : head much narrower than the 

 chest, dark ferruginous and clothed with red hairs behind and be- 

 neath, beset with black bristles behind and on the crown ; front co- 

 vered with ferruginous down ; clypeus beset with long black hairs 

 and bristles : eyes dark bronze, fore part slightly concave, composed 

 of rather large facets, and very distinct from the other part : lip 

 black, about twice the length of the head : feelers piceous; first and 

 second joints slightly clothed with black hairs ; second joint slightly 

 club-shaped, a little shorter than the first ; third joint nearly linear, 

 rather narrow at the base, conical at the tip, very much longer than 

 the first and the second joints : neck rather long : sides and hind 

 part of the chest beset with black hairs and bristles : breast clothed 

 with black and pale red hairs ; abdomen red, flat, decreasing in 

 breadth from the base to the tip, narrower than the chest and not 

 twice its length, thickly covered above and beneath with red hairs : 

 legs red, thickly clothed with red hairs ; hips, trochanters and knees 

 black ; thighs and shanks with a very few red bristles ; feet pi- 

 ceous towards the tips, thickly beset with black bristles ; claws black ; 

 foot-cushions tawny : wings black and adorned with bright blue 

 lustre ; wing-ribs and veins black ; poisers piceous. Length of the 

 body 14 lines ; of the wings 22 lines. 



a. Silhet. From Mr. Stainforth's collection. 



b. Silhet. From Mr. Sowerby's collection. 



Dasypogon Polygnotus, n. s., mas. et fem. Niger, thorace cinereo 

 vittis quatuor fuscis, abdomine rufo-fusco, antennis nigris arti- 

 culo 3° piceo, pedibus nigris, alis subnigris. 



Body black, dull : head hardly as broad as the chest, covered 

 with a hoary bloom, beset on the crown and along the rims of the 

 eyes with black bristles, clothed behind and beneath with hoary 

 hairs ; front covered with close shining whitish tawny down ; cly- 

 peus armed with some black and yellow hairs, and with six very 

 stout and long black bristles : eyes dark bronze, convex ; fore part 

 flat and composed of large facets, but the difference of the facets in 

 the two parts is not so closely defined as in some other species, and 

 they blend in size without any distinct boundary line : lip black, 

 stout, its tip clothed with a cluster of short yellow hairs ; palpi 



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